EP1291969A1 - Antenna à fente communtée - Google Patents

Antenna à fente communtée Download PDF

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Publication number
EP1291969A1
EP1291969A1 EP02292005A EP02292005A EP1291969A1 EP 1291969 A1 EP1291969 A1 EP 1291969A1 EP 02292005 A EP02292005 A EP 02292005A EP 02292005 A EP02292005 A EP 02292005A EP 1291969 A1 EP1291969 A1 EP 1291969A1
Authority
EP
European Patent Office
Prior art keywords
slot
antenna
line
microstrip line
receiving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02292005A
Other languages
German (de)
English (en)
Inventor
Mr. Ali Louzir
Mr. Franck Thudor
Mrs. Francoise Le Bolzer
Mr. Philippe Minard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1291969A1 publication Critical patent/EP1291969A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
    • H01Q21/205—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path providing an omnidirectional coverage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H01Q13/085—Slot-line radiating ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/242—Circumferential scanning

Definitions

  • the present invention relates to a switching device for apparatuses for receiving and/or transmitting signals which can be used more especially in the field of wireless transmissions.
  • the signals sent by the transmitter reach the receiver along a plurality of separate paths. At the receiver, this results in interference capable of causing fading and distortions of the transmitted signal and consequently a loss or deterioration of the information to be transmitted.
  • directional antennas of the horn, reflector or array type are usually used, these antennas being used for transmission and/or reception and making it possible to combat or attenuate the deterioration related to multiple paths.
  • the latter makes it possible, by spatial filtering, on the one hand to reduce the number of multiple paths, and hence to reduce the amount of fading, and on the other hand to reduce the interference with other systems operating in the same frequency band.
  • the switching operation is carried out by virtue of a switch external to the antenna.
  • this switch consists of diodes combined with power-adder/divider circuits and control electronics comprising at least n ports, making it possible to select one or more Vivaldi antennas from the n elements.
  • more than one diode is often used on each port.
  • losses from the power-adder/divider circuits are added to the coupling losses of the slotline-microstrip line transition needed for exciting Vivaldi antennas.
  • the diode state (on or off) is controlled by bias voltages. In order to be able to isolate the voltages provided on each port, circuits blocking the DC current (DC block) are used. These introduce additional losses.
  • a subject of the present invention is a device for receiving and/or transmitting signals comprising :
  • the slot antenna consists of at least one slot, printed on a substrate, one end of which flares gradually up to the edge of this substrate while the other end, which is not closed either, extends to another edge of the substrate.
  • the slot antennas are regularly arranged around a single, coplanar point, so as to be able to radiate in a sector with an angle of 360°.
  • FIG. 1 shows schematically a Vivaldi-type antenna printed on a substrate 3.
  • the structure and the performance of the Vivaldi antenna are well known to a person skilled in the art and are described especially in documents "IEEE Transactions on Antennas and Propagation" by S. Prasad and S. Mahpatra, Volume 2 AP-31 No. 3, May 1983 and "Study of discontinuities in open waveguide ⁇ application to improvement of radiating source model" by A. Louzir, R. Clequin, S. Toutain and P. Gélin, Lest Ura CNRS No. 1329.
  • the supply for the Vivaldi antenna of Figure 1 is based on the use of a transition between a supply line of the microstrip 7 type and a slot 6.
  • the other end of the microstrip line is connected to means 5 for transmitting and/or receiving signals of known type, which especially comprise a power amplifier.
  • Slot-line transitions by Knorr, IEEE, MTT, Vol. 22, pp. 548-554, May 1974 and to document "A Novel MIC Slot-Line Antenna" by Prasad and Mahapatra.
  • a device 4 which makes it possible to simulate the short circuit or the open circuit described above, is placed across the slot at a length of about k' ⁇ s/4.
  • a diode 4 has been positioned, but this could just as well be any other switch, such as for example a diode-mounted transistor or MEMs (microelectromechanical systems).
  • dimensioning of the slot antenna with quarter wavelengths makes it possible, at the crossover of the microstrip line and of the slot, to produce the impedance opposite that located a quarter wavelength further on: for example, the open circuit located at the end of the microstrip line is equivalent to a short circuit located at the crossover.
  • line theory makes it possible to confirm that the coupling is maximum when, at the crossover, the equivalent impedance of the microstrip line is a short circuit and that of the slot is an open circuit.
  • the coupling takes place when the diode is on, that is to say when the slot has an open circuit at the crossover and when the microstrip line has a short circuit at the crossover. Conversely, there is no coupling when the diode is off.
  • An improvement to the present invention is to produce a slot antenna providing 360° sequential coverage of space.
  • French Patent No. 00 15715 filed in the name of the applicant, proposes a compact antenna making it possible to increase the spectral efficiency of the array by reusing the frequencies by virtue of segmenting the physical space to be covered by the radiation pattern of the sectorial antenna.
  • the antenna proposed in French Patent Application No. 00 15715 consists of a coplanar circular arrangement around a central point of Vivaldi-type printed radiating elements making it possible to present several directional beams sequentially over time, the set of beams giving complete 360° coverage of space.
  • the length of the line between two slots is equal to k ⁇ m so as to obtain in-phase operation of the printed slot antennas.
  • the lower ends of the slots forming the Vivaldi antennas of the present improvement do not terminate in short circuits: the centre of the overall antenna is free from metallization, which makes it possible to isolate the various metallized plates (M12, M23, M34, M41) forming the slots (A1, A2, A3, A4) and therefore to terminate each one of them with an open circuit.
  • the switching is then carried out by controlling the electromagnetic coupling between the microstrip line and the exciter slot of the Vivaldi-type antenna.
  • the switching principle remains the same as for a single-slot antenna, and is still produced by placing a diode (D1, D2, D3, D4) or any other switch across the slot at a distance of about k' ⁇ s/4 from the microstrip line (k' being an odd integer) forming each antenna and making it possible to connect the two metallized surfaces forming the antenna.
  • the switching between the input/output microstrip line to one of the receiving/transmitting, respectively, Vivaldi antennas is controlled by setting the diodes corresponding to the chosen antenna to the on state and by keeping the other diodes in the off state.
  • the simple four-slot example will be taken to illustrate the selection in reception or in transmission of the Vivaldi antenna A1.
  • the switching between the input/output microstrip line 8 towards the Vivaldi antenna A1 is controlled by setting the diode D1 to the on state and by keeping the diodes D2, D3, D4 in the off state. This is made possible by applying a bias voltage to each metallized surface.
  • the surface M12 is set to the potential V12, M23 to V23, M34 to V34 and M41 to V41.
  • the diode D1 when the bias potential difference (V12-V41) is such that the diode D1 is in the on state (that is, for example (V12-V41) > V1, where V1 is the bias voltage of the diode D1), the diode is equivalent to a short circuit.
  • the potential difference is less than the bias voltage of the diodes.
  • all that is required is to apply a potential Vcc > V1 to the surface M12 and to connect all the other surfaces to the earth of the circuit.
  • the coupling is maximum at the antenna A1 and minimum at the three other antennas A2, A3 and A4.
  • a single antenna from the four was selected in transmission or in reception so as to transmit or receive, respectively.
  • the selection of one antenna out of four is illustrated by the table below with reference to Figure 3, which gives the values of potential to apply to the various metallized surfaces in order to effect switching:
  • the device needed for the present improvement consists of 4 diodes, which are placed across the slots, and of a small control circuit, which makes it possible to manage the various potentials of the metallized surfaces.
  • This device 10 may be inserted in the middle of the antenna since the latter consists of substrates, so as to limit the length of the connection wires as much as possible.
  • the complete switching device is therefore very compact and reduces losses because of the small number of diodes and the simplicity of the circuit controlling the bias potentials.

Landscapes

  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP02292005A 2001-09-04 2002-08-09 Antenna à fente communtée Withdrawn EP1291969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0111399 2001-09-04
FR0111399A FR2829298A1 (fr) 2001-09-04 2001-09-04 Dispositif de commutation pour des appareils de reception et/ou d'emission d'ondes electromagnetiques

Publications (1)

Publication Number Publication Date
EP1291969A1 true EP1291969A1 (fr) 2003-03-12

Family

ID=8866928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02292005A Withdrawn EP1291969A1 (fr) 2001-09-04 2002-08-09 Antenna à fente communtée

Country Status (7)

Country Link
US (1) US6847332B2 (fr)
EP (1) EP1291969A1 (fr)
JP (1) JP4209158B2 (fr)
KR (1) KR20030020824A (fr)
CN (1) CN1298112C (fr)
FR (1) FR2829298A1 (fr)
MX (1) MXPA02008448A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2853996A1 (fr) * 2003-04-15 2004-10-22 Thomson Licensing Sa Systeme d'antennes
EP2001081A1 (fr) * 2007-06-07 2008-12-10 ASUSTeK Computer Inc. Antenne intelligente ayant un diagramme de rayonnement réglable
FR2925772A1 (fr) * 2007-12-21 2009-06-26 Thomson Licensing Sas Dispositif rayonnant multi secteurs presentant un mode omnidirectionnel

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2904481A1 (fr) * 2006-07-31 2008-02-01 Thomson Licensing Sas Antenne de type fente a amplificateurs integres
US7397440B1 (en) * 2006-11-27 2008-07-08 The United States Of America As Represented By The Secretary Of The Navy Extended phase center tapered slot antenna
US20100289713A1 (en) * 2007-05-16 2010-11-18 Toru Taura Slot antenna
JP6039472B2 (ja) * 2013-03-15 2016-12-07 日東電工株式会社 アンテナモジュールおよびその製造方法
CN105206937A (zh) * 2015-08-31 2015-12-30 合肥工业大学 一种基于微同轴的vivaldi超宽带天线
CN113922051B (zh) * 2021-11-03 2023-05-26 西安邮电大学 一种具有自解耦特性的宽带mimo天线
CN118017215B (zh) * 2024-04-09 2024-06-14 西南科技大学 一种用于北斗导航的圆极化能量选择天线及枝节防护结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685901A2 (fr) * 1994-06-01 1995-12-06 AT&T Corp. Structure de source pour utilisation dans un système de communication sans fil
WO2000072406A1 (fr) * 1999-05-20 2000-11-30 Motorola Inc. Procede et appareil permettant de modifier les caracteristiques electriques d'une antenne dans un systeme de communication
FR2817661A1 (fr) 2000-12-05 2002-06-07 Thomson Multimedia Sa Dispositif pour la reception et/ou l'emission de signaux multifaisceaux

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2257964Y (zh) * 1996-05-03 1997-07-16 都世民 宽频带平面微带天线

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685901A2 (fr) * 1994-06-01 1995-12-06 AT&T Corp. Structure de source pour utilisation dans un système de communication sans fil
WO2000072406A1 (fr) * 1999-05-20 2000-11-30 Motorola Inc. Procede et appareil permettant de modifier les caracteristiques electriques d'une antenne dans un systeme de communication
FR2817661A1 (fr) 2000-12-05 2002-06-07 Thomson Multimedia Sa Dispositif pour la reception et/ou l'emission de signaux multifaisceaux

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
A. LOUZIR ET AL., STUDY OF DISCONTINUITIES IN OPEN WAVEGUIDE - APPLICATION TO IMPROVEMENT OF RADIATING SOURCE MODEL
JEFFREY B KNORR: "Slot-Line Transitions", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 22, May 1974 (1974-05-01), pages 548 - 554, XP002199674 *
SIEVENPIPER D ET AL: "Low-profile, four-sector diversity antenna on high-impedance ground plane", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 36, no. 16, 3 August 2000 (2000-08-03), pages 1343 - 1345, XP006015569, ISSN: 0013-5194 *
VAUGHAN M J ET AL: "28 GHZ OMNI-DIRECTIONAL QUASI-OPTICAL TRANSMITTER ARRAY", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE INC. NEW YORK, US, vol. 43, no. 10, 1 October 1995 (1995-10-01), pages 2507 - 2509, XP000530205, ISSN: 0018-9480 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2853996A1 (fr) * 2003-04-15 2004-10-22 Thomson Licensing Sa Systeme d'antennes
WO2004093250A1 (fr) * 2003-04-15 2004-10-28 Thomson Licensing Systeme d’antennes a fente rayonnante
US7408518B2 (en) 2003-04-15 2008-08-05 Thomson Licensing Radiating slit antenna system
EP2001081A1 (fr) * 2007-06-07 2008-12-10 ASUSTeK Computer Inc. Antenne intelligente ayant un diagramme de rayonnement réglable
FR2925772A1 (fr) * 2007-12-21 2009-06-26 Thomson Licensing Sas Dispositif rayonnant multi secteurs presentant un mode omnidirectionnel
US8593361B2 (en) 2007-12-21 2013-11-26 Thomson Licensing Multi-sector radiating device with an omni-directional mode

Also Published As

Publication number Publication date
JP2003133848A (ja) 2003-05-09
CN1298112C (zh) 2007-01-31
JP4209158B2 (ja) 2009-01-14
FR2829298A1 (fr) 2003-03-07
CN1407732A (zh) 2003-04-02
US6847332B2 (en) 2005-01-25
MXPA02008448A (es) 2005-08-26
US20030095073A1 (en) 2003-05-22
KR20030020824A (ko) 2003-03-10

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